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XAI co-founder’s startup River AI raises $1.1 billion to expand custom AI tools

By Thomson Reuters Aug 11, 2026 | 8:18 AM

Aug 11 (Reuters) – Startup River AI, founded by xAI co-founder Igor Babuschkin, said on Tuesday it has raised $1.1 ​billion, looking to expand tools ‌that help clients build personalized AI models on their own data.

The fundraise was led by General Catalyst and AMP PBC, with strategic investment ‌from ​Nvidia and AMD Ventures. ⁠Additional investors included ⁠Y Combinator and Temasek.

• River AI said it is betting that enterprise AI will shift from companies using general-purpose ​models from large labs to customizing and owning their own models, using ⁠open-weight models.

• The company ⁠added that its API allows ​enterprises to perform complex reinforcement-learning training runs ​in 15 to 20 minutes without an ‌infrastructure team and is two to four times more cost-effective than closed-source alternatives.

• “AI should be open, freely available, and ⁠affordable. It should feel like it is working for the person using it, not the lab ⁠that ‌trained it,” CEO Igor Babuschkin ⁠said.

• Babuschkin previously worked on ​generative-modeling ‌and reinforcement-learning at Google DeepMind ​and led ⁠large-scale training at OpenAI before co-founding xAI.

• River AI declined to comment on how much the funding valued it at.

(Reporting by Prathik Jayaprakash in Bengaluru; Editing by ​Joyjeet Das)